A property-value pair representing an additional characteristics of the entitity, e.g. a product feature or another characteristic for which there is no matching property in schema.org.

Note: Publishers should be aware that applications designed to use specific schema.org properties (e.g. http://schema.org/width, http://schema.org/color, http://schema.org/gtin13, ...) will typically expect such data to be provided using those properties, rather than using the generic property/value mechanism.

The GTIN-12 code of the product, or the product to which the offer refers. The GTIN-12 is the 12-digit GS1 Identification Key composed of a U.P.C. Company Prefix, Item Reference, and Check Digit used to identify trade items. See GS1 GTIN Summary for more details.

The GTIN-13 code of the product, or the product to which the offer refers. This is equivalent to 13-digit ISBN codes and EAN UCC-13. Former 12-digit UPC codes can be converted into a GTIN-13 code by simply adding a preceeding zero. See GS1 GTIN Summary for more details.

The model of the product. Use with the URL of a ProductModel or a textual representation of the model identifier. The URL of the ProductModel can be from an external source. It is recommended to additionally provide strong product identifiers via the gtin8/gtin13/gtin14 and mpn properties.

An additional type for the item, typically used for adding more specific types from external vocabularies in microdata syntax. This is a relationship between something and a class that the thing is in. In RDFa syntax, it is better to use the native RDFa syntax - the 'typeof' attribute - for multiple types. Schema.org tools may have only weaker understanding of extra types, in particular those defined externally.

A sub property of description. A short description of the item used to disambiguate from other, similar items. Information from other properties (in particular, name) may be necessary for the description to be useful for disambiguation.

Acknowledgement

This class is derived from the GoodRelations Vocabulary for E-Commerce, created by Martin Hepp. GoodRelations is a data model for sharing e-commerce data on the Web that can be expressed in a variety of syntaxes, including RDFa and HTML5 Microdata. More information about GoodRelations can be found at http://purl.org/goodrelations/.

We use the IndividualProduct type when we are concerned with the specific item,
rather than a set of indistinguishably similar items.
<div itemscope itemtype="http://schema.org/IndividualProduct" itemid="#product">
<link itemprop="additionalType" href="http://www.productontology.org/id/Racing_bicycle" />
<span itemprop="name">ACME Racing Bike in black (2008)</span>
<span itemprop="description">ACME Racing Bike, bought 8/2008, almost new, with a signature of
Eddy Merckx on the frame.</span>
</div>

We use the IndividualProduct type when we are concerned with the specific item,
rather than a set of indistinguishably similar items.
<div typeof="IndividualProduct" resource="#product">
<link property="additionalType" href="http://www.productontology.org/id/Racing_bicycle" />
<span property="name">ACME Racing Bike in black (2008)</span>
<span property="description">ACME Racing Bike, bought 8/2008, almost new, with a signature of
Eddy Merckx on the frame.</span>
</div>